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If you are interested in more OSSI varieties like those, check out Wild Garden Seed: https://www.wildgardenseed.com

The owner, the Frank Morton who was mentioned in article, is the original breeder of both Gildenstern and Dazzling Blue (and they probably grew the seed being sold by Fedco). All the varieties he bread (of which there are many) are released as OSSI varieties, plus they sell other OSSI varieties as well.